Table 3.

Description of models used for heifer pregnancy, stayability, and production traits in Red Angus cattle

Trait1	Fixed effects				Random effects
	Contemporary group	Sex	Age	AOD2	Direct additive genetic effect	Maternal additive genetic effect	Permanent environment effect
HPG	HPG	No	Yes	No	Yes	No	No
STAY	STAY	No	No	No	Yes	No	No
BWT	Birth	Yes3	No	Yes	Yes	No	No
Pre-WG	Weaning	Yes4	No	Yes	Yes	Yes	Yes
WW	Weaning	Yes4	No	Yes	Yes	Yes	Yes
Post-WG	Yearling	Yes4	No	Yes	Yes	No	No
YW	Yearling	Yes4	No	Yes	Yes	Yes	Yes
SC	Yearling	No	No	No	Yes	No	No
REA	Carcass	Yes4	Yes	No	Yes	No	No
BF	Carcass	Yes4	Yes	No	Yes	No	No
MARB	Carcass	Yes4	Yes	No	Yes	No	No
HCW	Carcass	Yes4	Yes	No	Yes	No	No
UREA	Ultrasound	Yes4	Yes	No	Yes	No	No
UBF	Ultrasound	Yes4	Yes	No	Yes	No	No
UIMF	Ultrasound	Yes4	Yes	No	Yes	No	No
TS	Calf Birth	No	Yes	No	Yes	No	Yes
US	Calf Birth	No	Yes	No	Yes	No	Yes
MW	Calf Weaning	No	Yes	No	Yes	No	Yes
BCS	Calf Birth	No	Yes	No	Yes	No	Yes

¹HPG= heifer pregnancy, STAY = stayability; BWT= birth weight; Pre-WG = Pre-Weaning Gain; WW = weaning weight; Post-WG = post weaning gain; YW = yearling weight; SC_D= scrotal circumference; REA = rib eye area; BF = backfat; MARB = marbling score; HCW = hot carcass weight; UREA = ultrasound rib eye area; UBF = ultrasound backfat; UIMF = ultrasound intramuscular fat; TS = teat score; US = udder suspension score; MW = mature weight; BCS = body condition score.

²Defined as 2, 3, 4, 5 to 9, 10, and 11+ years of age.

³Defined as bull and heifer.

⁴Defined as bull, heifer, and steer.